What is the format of the I2C command for accessing the VGA? I can write (and read where possible) all of the other components on the board but I can't seem to get any change in output from the VGA. That is that the range of codes from the ADC never changes whatever I write.
Since the VGA isn't really a register oriented device, taking only two 6b serial sequences concatenated together to program it perhaps there's something non-obvious about it. The demo application doesn't seem to touch it so there isn't anything for me to crib off of.